Blast Furnace Slag an overview ScienceDirect Topics. The bulk density of pelletized blast furnace slag is typically 850 kg/m 3 (55 lb cf). Appropriate production control ensures the formation of crystalline material, which is preferable for use as aggregate; this is in contrast to blast furnace slag pellets used in the manufacture of blast furnace cement (Neville, 2012).
Appropriate production control ensures the formation of crystalline material, which is preferable for use as aggregate; this is in contrast to blast furnace slag pellets used in the manufacture of blast furnace cement (Neville, 2012). Experience has shown that the coarser pellets have properties like crystalline slags and the finer pellets like
Nov 01, 2019· As a valuable byproduct of the iron-making process, blast furnace slag with temperature up to 1450–1650 ° C contains a tremendous amount of sensible heat. Dry granulation and waste heat recovery via a moving bed is an attractive alternative to the conventional water quenching method due to energy-savings and the reduction in water consumption.
@article{osti_5610662, title = {Heat recovery in dry granulation of molten blast furnace slag}, author = {Tetsuro, N and Hiroshi, N and Koichi, F and Tsukio, I}, abstractNote = {In a research and development project undertaken jointly between Ishikawajima-Harima Heavy Industries Co. and Sumitomo Metal Industries, Ltd., a process has been developed for granulating molten slag discharged from
Liquid slag produced in a blast furnace (BF)is at a temperature of around 1500?C and has a sensible heat of around 400Mcal/ton. BF slag is rich in CaO, SiO2, Al2O3, and MgO which are similar to the components of Portland cement. When this liquid BF slag is cooled fast enough then the solidified slag has a large percentage of glassy phase with high cementations activity and hence it can be used
Blast furnace slag cement is the mixture of ordinary Portland cement and fine granulated blast furnace slag obtained as a by product in the manufacture of steel with percent under 70% to that of cement. Ground granulated blast furnace slag cement (GGBFS) is a fine glassy granules which contain cementatious properties. In this article we
Aug 07, 2015· Slag formation is to be confined to a limited height of the blast furnace and the slag must be stable. The slag is to provide good permeability in the zone of slag formation. The melting point of the slag is to be neither too high nor too low. The final slag is to be fluid enough so that it is possible to drain it through tap hole,
Reducing expansion due to Delayed Ettringite Formation (DEF) is becoming an important issue that must be taken into account, when producing heat-cured concrete. Mineral additives used as partial cement replacement should help in achieving the desired aspect. Based on an ongoing experimental program, this research emphasizes on the effect of Blast Furnace Slag (BFS) on the expansion of
C + 2S -> CS2 Enthalpy of formation is the change in enthalpy for the formation of a substance from its elements. what is the density of liquid blast furnace slag
ficiency in the slag by injecting steam into the molten slag and thereby sup-press H2S formation during quenching. All of the slag produced at J & L is of the hard slag variety. The sulfur level is beyond our control since it comes from the sulfur in the coke used in the blast furnace operation. The slag tem-perature at the time of quenching has to
Reducing expansion due to Delayed Ettringite Formation (DEF) is becoming an important issue that must be taken into account, when producing heat-cured concrete. Mineral additives used as partial cement replacement should help in achieving the desired aspect. Based on an ongoing experimental program, this research emphasizes on the effect of Blast Furnace Slag (BFS) on the expansion of
Blast furnace melting slag temperature up to 1400 ~ 1500?, high heat, is a high quality waste heat resources.The treatment process is mainly water quenching in China.A large amount of high temperature slag is cooled by slag water, and a large amount of hot water at 70 ~ 85?is produced.Usually, in order to ensure the recycling effect of the slag
K. Gong and C. E. White, “Impact of chemical variability of ground granulated blast-furnace slag on the phase formation in alkali-activated slag pastes,” Cement and Concrete Research, vol. 89, pp. 310–319, 2016. View at: Google Scholar
3-MgO-FeO SLAG 225 Introduction Viscous behaviour of blast furnace (BF) slags plays an important role that affects operation efficiency since the flow pattern of molten slags has a significant influence on gas permeability, heat transfer, and the reduction of SiO 2 and FeO.
Researchers have studied the dehydration and rehydration of Portland cement. In this study, hydrated cement pastes (HCPs) prepared from Portland blast furnace slag cement (PBFSC), were heat treated at 700ºC and 900ºC and used in the preparation of rehydrated cement powders in air (RCPs-air) and rehydrated cement paste (RCPs) with water/cement ratios (w/c) of 0.3 and 0.5.
The specific heat is determined for hardening cement paste samples made with blast furnace slag cement. It is concluded that the specific heat and thermal diffusivity decreases linearly with the
Jan 01, 2020· Activation of Blast Furnace Slag with Soda Production Waste is attributed to formation of amorphous phases and partly crystalline calcium silicate hydrate (C-S-H). Increasing SSW content causes a weaker and broader rate of heat evolution peak in the first few hours and evolves greater total heat in the first day. SSW-activated slag
a blast furnace body is one of the restrictive links of blast furnace longevity.4) In recent years, Chinese commercial blast furnaces have suffered a large amount of economic losses due to the damage of copper stave.5,6) The formation of slag crust on the cooling stave of a blast furnace plays
May 09, 2018· Ground Granulated Blast Furnace Slag (GGBS) and Ordinary Portland Cement (OPC) [Quora] Chemical Composition of Ground Granulated Blast Furnace Slag. The composition of slag essentially depends on the raw materials used in the iron production process. Typical chemical composition contains calcium oxide 40%, silica 35%, alumina 13% and magnesia 8%.
<Blast Furnace: Fuels & Raw Materials> Now, the blast furnace will melt all the raw materials and extract only the iron (Fe), where coke and pulverized coal fuel the raw materials. Coke is a grey, hard, and porous fuel made by heating coal up to 1000℃. Inside the furnace, coke is the main heat source melting various materials.
This is the first comprehensive work of using integrated heat transfer, fluid flow dynamics and solidification numerical simulation to investigate skull formation phenomena in a blast furnace hearth.
Abstract Three new ceramic batches with no traditional fluxes and 30, 50 and 70 wt.% blast furnace slag were studied. The processes of phase formation and densification were estimated in non-isothermal conditions by differential thermal analysis and dilatometry, respectively. After that the degrees of sintering, obtained after heat-treatment at different temperatures and times, were evaluated
Dry Granulation of Blast Furnace Slag for Heat Recovery Blast furnace slag is known as a by-product from the production of hot metal at integrated steel and iron mills. Approximately 300 kg of this liquid slag with a temperature of about 1500°C is tapped together with each ton hot metal.
The process is carried out in a blast furnace. The formation of GGBFS is not direct. The by-product of iron manufacturing is a molten slag and molten iron. The molten slag consists of alumina and silica, also with the certain amount of oxides. This slag is later granulated by cooling it. For this, it is allowed to pass through a high-pressure
a blast furnace body is one of the restrictive links of blast furnace longevity.4) In recent years, Chinese commercial blast furnaces have suffered a large amount of economic losses due to the damage of copper stave.5,6) The formation of slag crust on the cooling stave of a blast furnace plays
Abstract Three new ceramic batches with no traditional fluxes and 30, 50 and 70 wt.% blast furnace slag were studied. The processes of phase formation and densification were estimated in non-isothermal conditions by differential thermal analysis and dilatometry, respectively. After that the degrees of sintering, obtained after heat-treatment at different temperatures and times, were evaluated
A blast furnace is a type of metallurgical furnace used for smelting to produce industrial metals, generally pig iron, but also others such as lead or copper. Blast refers to the combustion air being "forced" or supplied above atmospheric pressure.. In a blast furnace, fuel (), ores, and flux are continuously supplied through the top of the furnace, while a hot blast of air (sometimes with
Dec 30, 2019· When iron ore is reduced in a blast furnace, some of the S i O 2 impurity is also reduced by reaction with carbon to give elemental silicon and carbon monoxide. The silicon is subsequently reoxidised in basic oxygen process, and the resulting S i O 2 reacts with C a O,yielding slag.
Dry Granulation of Blast Furnace Slag for Heat Recovery Blast furnace slag is known as a by-product from the production of hot metal at integrated steel and iron mills. Approximately 300 kg of this liquid slag with a temperature of about 1500°C is tapped together with each ton hot metal.
<Blast Furnace: Fuels & Raw Materials> Now, the blast furnace will melt all the raw materials and extract only the iron (Fe), where coke and pulverized coal fuel the raw materials. Coke is a grey, hard, and porous fuel made by heating coal up to 1000℃. Inside the furnace, coke is the main heat source melting various materials.
The slag was obtained from the iron blast furnace of Karabük Iron Steel Workings (Turkey). Triton X-100 (Dow Chemical Company) dispersant was used in the study to produce the blast furnace slag/water nano-fluid via direct-synthesis. The 2 wt% concentration of blast furnace slag/water nano-fluid was used as the working fluid in heat pipes. A
0.2 to 0.4 tons of slag, and 2.5 to 3.5 tons of blast furnace gas containing up to 100 pounds (lb) of dust. The molten iron and slag are removed, or cast, from the furnace periodically. The casting process begins with drilling a hole, called the taphole, into the clay-filled iron notch at the base of the hearth.
The process is carried out in a blast furnace. The formation of GGBFS is not direct. The by-product of iron manufacturing is a molten slag and molten iron. The molten slag consists of alumina and silica, also with the certain amount of oxides. This slag is later granulated by cooling it. For this, it is allowed to pass through a high-pressure
Extraction of Metals. Extraction of Iron.. Chemistry of the blast furnace ().. Limestone is calcium carbonate (CaCO 3) and it is added to the blast furnace to remove the impurities in the iron ore. Calcium carbonate is decomposed by heat in the furnace to give calcium oxide and carbon dioxide. This is called thermal decomposition (see examples of other carbonates).
Formation of solid slag on the and blast furnace slag needs a rapid cooling in the processing procedure. The concept combines the two procedures and utilises the sensible heat of blast furnace slag to produce coal gas. Coal powder and liquid slag are mixed before being sent into a rotating cup. The mixture is granulated and
Nov 02, 2013· The scaffold formation near the top of the bosh often results because of excessive fines in the burden material and a higher than normal lime chemical composition of the slag (Reflected by the higher basicity of the slag). the channeling leads to the increase of the heat load at the walls of the blast furnace. Due to the fines, the
Supplementary cementitious materials such as blast-furnace slag (BFS) and pulverised-fuel ash have been used as a partial replacement for Portland cement (PC) in UK and international nuclear waste encapsulation for many years (Angus et al., 2010; Sharp et al., 2003).Encapsulation in a cementitious wasteform is the current preferred method of disposal of intermediate level waste in the UK
heat of formation of blast furnace slag. Cold experiments on ligament formation for blast furnace, The reactivity index of coal at 1673 K was about 16 times faster than that at 1573 K, when the coal/slag ratio was 1:0 The BFS (blast furnace slag) acted as not only a heat carrier but also an .
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